Militia service did not count (here at least) towards his pension.
I do not think he received a pension for his army service. In the Army Reserve he would have received half pay in exchange for two weeks annual training. They would have stopped his pay after failing to receive a ‘life certificate’. He failed to turn up for his quarterly pay and failed to send someone with a life certificate (signed by a policeman, clergyman etc) to prove he was alive. So as far as the army were concerned he had died/disappeared. The final entry says “Did not report before Time Ex(pired)’, and they signed him off after the 12 years was up.
This leaves the calculation of when he would be 65. It may be that he resurfaced wanting an old age pension, and they were checking on the past. Or a clerk was told to get rid of all old files, including anyone who had reached 65, and they had not heard from. You will never really now.
The two weeks training was in the summer, so failing to claim his quarterly pay of about 45 shillings in January makes no sense. So he probably was dead or had emigrated. Even if he was in prison he could send a Life Certificate, and still get paid for when he was out.
About 40 Robert Richmond’s received medals for WW1. You could look at the WW1 enlistments for USA, Canada, Australia and NZ, as well as the UK ones on Ancestry. As well as following the wife – who was probably glad to see the back of him.
I see he earned he Queens South Africa medal with three clasps. There was another Richmond in the 13th Hussars - 4478, initial G. Against him it says “Medal Forfeit: Discharged for misconduct 03/01/07”.
Ken